tree a41fb9c4a5501ec5eecf1d25fec3e87a564f771d
parent 7b1a88cf2a276f26d7f22c09f05accd3c750ca35
author Asiri Rathnayake <asiri.rathnayake@arm.com> 1464179794 +0000
committer Asiri Rathnayake <asiri.rathnayake@arm.com> 1464179794 +0000

Introduce a native-only unwinder build.

Currently libunwind is built to support cross-unwinding [1] by default, which
requires the buffers unw_context_t and unw_cursor_t to be large enough to hold
the vritual register set (VRS) of any supported architecture. This is not
desirable for some platforms where the stack usage of the unwinder needs
to be kept to a minimum (e.g. bare-metal targets). The current patch introduces
a native-only (-DLIBUNWIND_ENABLE_CROSS_UNWINDING=OFF) unwinder variant that
adopts strict sizes for the buffers unw_context_t and unw_cursor_t depending
on the target architecture.

[1] http://www.nongnu.org/libunwind/man/libunwind(3).html#section_4

Change-Id: I380fff9a56c16a0fc520e3b1d8454a34b4a48373

git-svn-id: https://llvm.org/svn/llvm-project/libunwind/trunk@270692 91177308-0d34-0410-b5e6-96231b3b80d8